CR2430 vs CR2450
The CR2430 and CR2450 are 3 volt lithium coin cells with the identical 24.5 mm diameter, split by height: 3 mm versus 5 mm. The taller CR2450 roughly doubles the capacity, 550-plus mAh against about 285. Compartments are molded for one height, so they do not interchange.
| CR2430 | CR2450 | |
|---|---|---|
| Chemistry | Lithium manganese dioxide (Li/MnO2) | Lithium manganese dioxide (Li/MnO2) |
| Voltage | 3 V | 3 V |
| Diameter | 24.5 mm | 24.5 mm |
| Height | 3 mm | 5 mm |
| Capacity | 270-300 mAh | 550-620 mAh |
| Also sold as | DL2430, ECR2430 | DL2450, ECR2450, CR2450N (Renata, flanged) |
This pair generates constant misorders because the names differ by one digit and the cells look alike in photos. The final two digits are the height in tenths of a millimeter, and that 2 mm gap is decisive in practice: a CR2450 cannot squeeze into a fob or sensor built for the CR2430, and a CR2430 in a CR2450 holder leaves an air gap above the cell, producing intermittent contact that mimics a dying device.
Both sizes concentrate in the same product categories, which sharpens the confusion. European car fobs split between them: many Volvos take the CR2430 while various BMW and Land Rover keys take the CR2450. Wireless sensors, remotes and medical wearables likewise use both. The only reliable identification is the code stamped on the cell you removed or molded into the compartment floor.
If a device genuinely accepts both heights, which occasionally happens with spring-loaded contacts, the CR2450 is the obvious fill for its doubled capacity. But treat that as the exception; assume exact-match until the hardware proves otherwise.